Generally, raw meat, unfresh meat and preserved meat are not recommended, while other fresh, fully cooked and less processed meats can be consumed in moderation. 1. Raw meat: Raw meat may be contaminated by roundworm, rapworm, pork tapeworm and other eggs, human consumption of raw meat may lead to parasitic diseases, endangering human health. At the same time, the protein absorption rate and bioavailability of raw meat is low, from the nutritional point of view is also not conducive to human health. 2. Unfresh meat: Unfresh meat is easily contaminated by bacteria such as Staphylococcus aureus, Escherichia coli, and Salmonella, which can cause food poisoning and other adverse reactions, resulting in nausea, vomiting, diarrhea and other symptoms. 3. Cured meat: in the processing of meat curing process, need to add nitrite to extend the shelf life of meat. Nitrite after the body’s reductase enzyme, will produce nitrosamine, nitrosamine is a class 1 carcinogen, has a strong carcinogenicity, so do not recommend cured meat, including ham, sausage, bacon and so on. It is recommended to eat a sensible diet, consume natural and less processed food to avoid food contamination.